Last Friday, January 10th, is a day I'll remember because of this tooth.     It is always a thrill to find one of my favorite fossils, and this one, by size alone, makes it a tooth from a small horse that predates Equus sp. I find enough of these teeth to consider my self above average knowledge on these late Miocene horses. An early Miocene horse: Parahippus is a horse that evolved in North America about 18 million years ago and one of the best examples of Parahippus i